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Deposits - Certificates of deposits and Scheduled maturities of time deposits (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019
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Deposits |  |  |
Aggregate amounts of certificates of deposits in denominations of $250,000 or more | $ 832,400 | $ 303,200 | $ 316,400
Traditional, out-of-market brokered deposits | 600,000 | 0 | 1,300
Other Time Deposits | $ 9,374 | $ 3,999 | $ 7,246

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- Definition The aggregate amount of certificates of deposits liabilities in denominations of $250,000 or more. + References No definition available. + Details
Name: | ssb_CertificatesOfDeposit250000OrMore
Namespace Prefix: | ssb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | ssb_DepositsDisclosureAbstract
Namespace Prefix: | ssb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the amount of other time deposits, not otherwise specified in the taxonomy, that cannot be withdrawn before a set date without penalty or for which notice of withdrawal is required. + References No definition available. + Details
Name: | ssb_OtherTimeDeposits
Namespace Prefix: | ssb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of interest-bearing domestic third-party deposits placed by or through the assistance of a deposit broker, also known as brokered deposit liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
Name: | us-gaap_InterestBearingDomesticDepositBrokered
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant